Wireshark · Ethereal-dev: Re: [Ethereal-dev] one question about UMTS RANAP decoder

[Guy Harris <gharris@xxxxxxxxx>]

chao_zhao@xxxxxxxxxxx wrote:

> I am a new user to Ethereal applied to RANAP interpreting.As you know 
> that Ethereal now can support UMTS RANAP protocol decoding.RANAP is 
> encoded in ASN.1 PER ALIGNED syntax.Who can tell me which ASN compiler 
> is used by Ethereal?

In the case of RANAP, the compiler is called "Martin Held". :-)

I.e., the RANAP dissector was built by hand by Martin Held (and assorted 
other people).  (It doesn't even use packet-per.c.)

Other ASN.1 (BER, DER, PER)-based dissectors were either written by hand 
(using packet-ber.c or packet-per.c routines, or the old asn1.c 
routines), or generated by the asn2eth compiler, which is part of 
Ethereal, and compiles ASN.1 specifications (and some additional 
information) into protocol dissectors.  (Note that it compiles them into 
protocol dissectors, *NOT* into protocol implementations of the sort 
that would be useful in a machine on the network.  It could perhaps be 
made to generate such a protocol implementation, but that wasn't what it 
was designed for.)